Switch to MusicBrainz for song verification, YouTube Music for playback links

backend/app/services/musicbrainz.py

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+"""MusicBrainz API client for verifying songs exist."""
+
+import httpx
+
+MB_API_URL = "https://musicbrainz.org/ws/2"
+HEADERS = {
+    "User-Agent": "Vynl/1.0 (chris.ryan@deepcutsai.com)",
+    "Accept": "application/json",
+}
+
+# MusicBrainz rate limit: 1 request per second
+import time
+_last_request_time = 0.0
+
+
+def _rate_limit():
+    global _last_request_time
+    now = time.time()
+    elapsed = now - _last_request_time
+    if elapsed < 1.1:
+        time.sleep(1.1 - elapsed)
+    _last_request_time = time.time()
+
+
+def verify_track(artist: str, title: str) -> dict | None:
+    """Verify a track exists on MusicBrainz and return canonical data.
+
+    Returns dict with: artist, title, album, mb_id or None if not found.
+    """
+    _rate_limit()
+    try:
+        resp = httpx.get(
+            f"{MB_API_URL}/recording",
+            params={
+                "query": f'artist:"{artist}" recording:"{title}"',
+                "fmt": "json",
+                "limit": 5,
+            },
+            headers=HEADERS,
+            timeout=10,
+        )
+        if resp.status_code != 200:
+            return None
+
+        data = resp.json()
+        recordings = data.get("recordings", [])
+
+        for rec in recordings:
+            score = rec.get("score", 0)
+            if score < 70:
+                continue
+
+            rec_title = rec.get("title", "")
+            rec_artists = rec.get("artist-credit", [])
+            rec_artist = rec_artists[0]["name"] if rec_artists else ""
+
+            # Get album from first release
+            album = None
+            releases = rec.get("releases", [])
+            if releases:
+                album = releases[0].get("title")
+
+            return {
+                "artist": rec_artist,
+                "title": rec_title,
+                "album": album,
+                "mb_id": rec.get("id"),
+                "score": score,
+            }
+
+        return None
+    except Exception:
+        return None
+
+
+def search_artist(artist: str) -> dict | None:
+    """Verify an artist exists on MusicBrainz."""
+    _rate_limit()
+    try:
+        resp = httpx.get(
+            f"{MB_API_URL}/artist",
+            params={
+                "query": f'artist:"{artist}"',
+                "fmt": "json",
+                "limit": 3,
+            },
+            headers=HEADERS,
+            timeout=10,
+        )
+        if resp.status_code != 200:
+            return None
+
+        data = resp.json()
+        artists = data.get("artists", [])
+        for a in artists:
+            if a.get("score", 0) >= 80:
+                return {
+                    "name": a.get("name"),
+                    "mb_id": a.get("id"),
+                    "score": a.get("score"),
+                }
+        return None
+    except Exception:
+        return None